Image copyrightHywel GeorgeImage caption
Andreas Leonardu and Kharl Pitman discuss the effect of the event on their businesses

Jonathan Morgan, from IT company Object Matrix, said: "We told staff they can't drive to work that week and we're not expecting any deliveries - but as a company trading internationally, if communications links aren't affected, we're happy to see the event on our doorstep."

Not all city businesses expect to benefit.

"We see it on big rugby days," said Tim Corrigan, owner of the café chain Milk and Sugar.

"Different businesses benefit from the larger events - the bars, restaurants and hotels."

"It's an amazing thing that's bringing millions to Cardiff. So what I am looking to do is to start a social media campaign to target people coming into Cardiff and staying in the hotels."

Image caption
Cardiff residents are looking to rent out their homes to football fans

The hotels have been booked for weeks and there has been huge interest through accommodation websites.

"All our accommodation is full," claimed Nigel Read from Penarth-based estate agent Sea Breeze homes. "It's a very, very good time for the company."

But he added: "The council haven't come forward to tell us what's happening and they haven't given us any support."

A team of business owners, under the leadership of coach Cindy Williams and the banner Cyn-gost, is providing a helpline - 02920 107700 - "so we can communicate and understand, and make things a little less impactful".

They also have events planned for 31 May and 2 June in a bid help businesses in the last days of build-up and beyond.

Miss Williams said: "Over the past few weeks we have been concerned with the number of businesses yet to plan or engage with Cardiff council.

"We believe many are ill-informed, which will result in costly mistakes, or businesses simply failing to capitalize on the potential benefits.

"A 24-hour helpline, manned by experienced business owners, will provide expert, informed, and up to date advice."

Issues they are unable to help with will be logged to help with future events.

Cyn-gost member Jason Dunlop, from the consultancy A Critical Friend, said the legacy of UEFA was important.

"We will sit down with companies to look back at the Champions League data and then share the learnings with council, government and other stakeholders to improve the experience, when other world events come to our great city," he said.

Image copyrightCardiff City CouncilImage caption
An aerial view of the Champions Festival planned for Cardiff Bay

A council spokesman said a team of officers had been visiting every business across the city to give information on the arrangements since March.

"This week the council worked with the Business Improvement District and the Licensee Forum to present to 400 business representatives, with staff on hand to answer any questions," he added.

"Due to the necessary security arrangements that need to be put in place, businesses need to plan ahead so they can make the most of this opportunity.

"In our meetings with businesses across the city centre we have worked hard to ensure they are aware of this and of course we are working with businesses to help facilitate their requirements where we can within the security plan.

"If there are any businesses who feel they have not had the necessary information we would urge them to contact highwaysnetworkmanagement@cardiff.gov.uk

"Also, the Cardiff 2017 website which is updated regularly, contains essential advice for businesses residents and visitors around the event."